<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<!-- 数据代理:通过一个对象代理另一个对象中属性的操作(读/写) -->
		<script type="text/javascript">
			let obj = {
				x: 100
			}
			let obj2 = {
				y: 200
			}
			Object.defineProperty(obj2, 'x', {
				get() {
					return obj.x
				},
				set(value) {
					obj.x = value
				}
			})
		</script>
	</body>
</html>
